STATUS = 0xFE
SEND_PACKET = 0x03
RECV_PACKET=0x04
QUERY_EDID  = 0x05
QUERY_HOT_PLUG = 0x06
REPLY_EDID = 0x07
REPLY_HOT_PLUG = 0x08
QUERY_5V = 0x09
REPLY_5V = 0x10


MEMFREE = 0xF0
UNPLUGGED = 0x00
PLUGGEd = 0x01
V_OFF = 0x00
V_ON = 0x01